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Tunable Mid‐Infrared Phase‐Change Metasurface
Author(s) -
Dong Weiling,
Qiu Yimei,
Zhou Xilin,
Banas Agnieszka,
Banas Krzysztof,
Breese Mark B. H.,
Cao Tun,
Simpson Robert E.
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201701346
Subject(s) - materials science , plasmon , chalcogenide , infrared , optics , optoelectronics , transmittance , interferometry , dielectric , multispectral image , metamaterial , reflection (computer programming) , refractive index , optical filter , physics , computer science , computer vision , programming language
The intense light–matter interaction of plasmonic metasurfaces provides an appealing platform for optical sensing. To date, most metasurface sensors are not spectrally tuned. Moreover, they operate in a total reflection mode, which complicates the optical setup. Transmissive tunable filters are therefore desirable. A mid‐infrared (M‐IR) tunable metasurface is described that operates in transmission mode. The resonant frequency of the filter is tuned by nonvolatile phase transitions to the dielectric properties of the chalcogenide material Ge 2 Sb 2 Te 5 . A broad transmittance spectral shift of 500 nm across the M‐IR region is experimentally demonstrated. This shift is in good agreement with finite‐difference time‐domain simulations of the same structure. The design paves the way for on‐chip M‐IR multispectral interferometry and provides a promising approach for compact real‐time M‐IR measurements.